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Impact of Cesium in Phase and Device Stability of Triple Cation Pb-Sn Double Halide Perovskite Films and Solar Cells

Abstract

Triple cation Cs/methylammonium (MA)/formamidinium (FA) and double halide Br/I lead perovskites improved the stability and efficiency of perovskite solar cells (PVSCs). However, their effects on alloyed Pb-Sn perovskites are unexplored. In this work, perovskite thin films with the composition Csx(MA0.17FA0.83)1-xPb1-ySny(I0.83Br0.17)3 are synthesized utilizing a one-step solution process plus anti-solvent wash technique and deployed in PVSCs with an inverted architecture. All films show a cubic crystal structure, demonstrating that compositional tuning of both tolerance factor and crystallization rate allow for dense, single phase formation. The band gaps, affected by both lattice constriction and octahedral tilting, show opposite trends in Pb-rich or Sn-rich perovskites with the increase of Cs for fixed Sn compositions. The Cs0.05(MA0.17FA0.83)0.95Pb0.25Sn0.75(I0.83Br0.17)3 PVSCs achieve the power conversion efficiency (PCE) of 11.05%, a record for any PVSC containing 75% Sn perovskites, and the Cs0.10(MA0.17FA0.83)0.90Pb0.75Sn0.25(I0.83Br0.17)3 PVSCs reach a record PCE of 15.78%. Moreover, the triple cation and double halide alloyed Pb-Sn perovskites exhibit improved device stability in inert and ambient conditions. This study, which illustrates the impact of cation and halide tuning on alloyed Pb-Sn perovskites, can be used to further eliminate Pb and improve device performance on high Sn PVSCs and other optoelectronic devices

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Publication details

The article was received on 04 Jul 2018, accepted on 10 Aug 2018 and first published on 11 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA06391E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Impact of Cesium in Phase and Device Stability of Triple Cation Pb-Sn Double Halide Perovskite Films and Solar Cells

    G. A. Tosado, Y. Lin, E. Zheng and Q. Yu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06391E

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